Ruling · Candra Ṣaṣṭhī · 1912

Tuesday 1 October

Boundaryin Daqing, under the Rashtriya Panchang method. Ṣaṣṭhī reaches moonrise on neither day and the rule does not say what then. Say “contested”.

Decide it for

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two moonrises

One ghaṭī is 24 minutes. The moonrise is read as disc centre, 31′.

Moonrise of Tuesday 1 October

Taken. Ṣaṣṭhī reaches neither moonrise; this is the day it falls on.

19:20 moonrise
Ṣaṣṭhī begins 20:25:45
18:0818:3218:5619:2019:4420:0820:32

Absent at moonrise

Moonrise of Wednesday 2 October

Ṣaṣṭhī does not hold at moonrise. Not taken.

20:04 moonrise
Ṣaṣṭhī ends 19:16:49
18:5219:1619:4020:0420:2820:5221:16

Absent at moonrise

Ṣaṣṭhī presentMoonrise, the instant the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Ṣaṣṭhī runs from 20:26 on Tue 1 Oct to 19:17 on Wed 2 Oct.

    1912-10-01T12:25:45Z → 1912-10-02T11:16:50Z

  2. 02

    Kāla

    Moonrise is at 19:20 on the 1st and 20:04 on the 2nd.

    moonrise: disc centre, 31′

  3. 03

    Rule

    Ṣaṣṭhī must be current at moonrise. It is not on the 1st and is not on the 2nd.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Neither moonrise qualifies. The day the tithi falls on is taken.

    priority: purvaviddha → tithi-day · margin 2810 s

  5. 05

    Ruling

    Candra Ṣaṣṭhī, Daqing, 1912: Tuesday 1 October.

    confidence: boundary (absent-unstated)

Say it like this

In Daqing, Candra Ṣaṣṭhī 1912 falls on Tuesday 1 October. Ṣaṣṭhī runs from 20:26 on Tue 1 Oct to 19:17 on Wed 2 Oct, and is current at moonrise on neither day.

ahargana.org/daqing/festivals/1912/chandra-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 1 Oct
Ahargaṇa, classicalDisc centre, no refractionTue 1 Oct
compat-drikpanchangComparison profileTue 1 Oct
No institution has a recorded ruling for Daqing.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/chandra-shashthi · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Kṛṣṇa · Ṣaṣṭhī
Kāla
Moonrise
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 103

“K 6 Candra sasthi (Sasthi current at moon-rise, if occurs on two successive days, it is to be observed on the first day).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceṢaṣṭhīMoonrise 1stCoveredMoonrise 2ndCoveredRuled
Los Angeles04:26 → 03:1720:53holds21:50no1 Oct
Chicago06:26 → 05:1720:17holds21:11no1 Oct
Jersey City07:26 → 06:1720:26holds21:20no1 Oct
Port of Spain08:26 → 07:1721:59holds22:58no1 Oct
London12:26 → 11:1719:26holds20:10no1 Oct
Durban14:26 → 13:1723:08holds00:13no1 Oct
Dubai16:07 → 14:5821:01holds21:56no1 Oct
Delhi17:56 → 16:4721:10holds22:03no1 Oct
Kolkata17:56 → 16:4720:40holds21:34no1 Oct
Singapore19:26 → 18:1721:52holds22:50no1 Oct
Sydney22:26 → 21:1722:57holds00:04no1 Oct
Suva00:21 → 23:1222:17no23:20no1 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
chandra-shashthi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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